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Optics Letters

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  • Vol. 36, Iss. 9 — May. 1, 2011
  • pp: 1734–1736

Photodegradation of melanin by an interferometric technique

C. W. Farley, A. Kassu, and A. Sharma  »View Author Affiliations


Optics Letters, Vol. 36, Issue 9, pp. 1734-1736 (2011)
http://dx.doi.org/10.1364/OL.36.001734


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Abstract

Photodegradation of melanin thin films is investigated for a UVA wavelength of 355 nm and a UVC wavelength of 244 nm . The technique involves interferometric exposure of melanin with two coherent beams from a low-power UV laser. The periodic photodegradation-grating pattern is monitored by diffraction of a second low-power He–Ne laser. Dependence of the photodegradation rate on UV intensity as well as the effect of ambient humidity is investigated and explained with a simple model. The technique has promise for investigating photo-induced effects in other biomolecular substrates as well.

© 2011 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(310.6860) Thin films : Thin films, optical properties
(160.1435) Materials : Biomaterials

ToC Category:
Diffraction and Gratings

History
Original Manuscript: February 10, 2011
Revised Manuscript: April 6, 2011
Manuscript Accepted: April 6, 2011
Published: April 29, 2011

Virtual Issues
Vol. 6, Iss. 6 Virtual Journal for Biomedical Optics

Citation
C. W. Farley, A. Kassu, and A. Sharma, "Photodegradation of melanin by an interferometric technique," Opt. Lett. 36, 1734-1736 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-9-1734


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